यदि (n(U)=84) और (n(A)=2n\(A^c\)) है, तो (n\(A^c\)) कितना होगा?
If (n(U)=84) and (n(A)=2n\(A^c\)), what is (n\(A^c\))?
Explanation opens after your attempt
A. (28)
Concept
Let (n\(A^c\)=x), then (n(A)=2x). Thus (2x+x=84), giving (x=28).
Why this answer is correct
The correct answer is A. (28). Let (n\(A^c\)=x), then (n(A)=2x). Thus (2x+x=84), giving (x=28).
Exam Tip
मान लें (n\(A^c\)=x), तब (n(A)=2x)। इसलिए (2x+x=84) से (x=28) मिलेगा।
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